Fig. 2
a The tumor was low signal intensity on T1-weighted images, located in the distal planta before the operation. b The tumor was low signal intensity on T2-weighted images before the operation. c The tumor was adhered with the common plantar digital nerve. d For the deep type, the lesion had a lobulated appearance. Every lobulated one was separated with the narrowed and lacunar infarction, around which the remaining tendon sheath structure could be seen. It constituted discrete fibroblast, the confined lacuna vasorum and red collagen fibers. The fibroblast had the shape of short shuttle, the partial cells were rich with bundles of spindle-shaped arrangement (original magnification ×100)